JP2006064620A - Current sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensively formable current sensor having a guide part for fixing an electric wire to be measured. <P>SOLUTION: The current sensor 1A is provided with both a sensor main body 3 having an electric wire insertion hole 3a for the insertion of the electric wire to be measured and a fixing guide 5 mounted on the sensor main body 3 in such a way as to be freely attached and removed and having the guide part 5a which is protruded in the direction of a center axis C of the electric wire insertion hole 3a and to which the electric wire is fixed. With the fixing guide 5 mounted on the sensor main body 3, the guide part 5a is formed in the fixing guide 5 in such a way that the interval between an electric wire fixing surface 5i of the guide part 5a and the center axis C of the electric wire insertion hole 3a may be equal to a distance smaller than the radius of the electric wire insertion hole 3a. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a current sensor that enables measurement of a current flowing through an electric wire to be measured by inserting the electric wire to be measured into the electric wire insertion hole of the current sensor.

  As a method of fixing this type of current sensor to the measurement target electric wire, a guide portion is integrally formed on the current sensor so as to protrude along the central axis direction of the electric wire insertion hole, and the measurement target is measured on the guide portion. There is a proposal to fix the current sensor to the electric wire to be measured by fixing the electric wire by taping or the like.

  There are Patent Documents 1 and 2 as prior art documents relating to this type of current sensor.

JP 2000-321309 A JP 2002-189038 A

  In the above proposal, since the guide portion is integrally formed with the current sensor, there is a drawback that the mold used for the formation becomes complicated and the manufacturing cost is increased.

  In addition, if the distance between the center axis of the wire insertion hole and the wire fixing surface of the guide portion is larger than the radius of the wire insertion hole, the wire to be measured (the wire inserted through the wire insertion hole) and the wire fixing surface of the guide portion If the wire is fixed to the guide part in that state, unnecessary stress is applied to the guide part. Is not preferable. Therefore, it is necessary to form the guide portion in the current sensor so that the distance between the central axis of the wire insertion hole and the wire fixing surface of the guide portion is a distance within the radius of the wire insertion hole.

  However, in general, this type of current sensor has an open surface (incorporation of circuit components) inside a box-shaped resin case with an open top surface in which a cylinder that is a through hole is formed on the bottom surface. The circuit component (annular magnetic core, Hall element, etc.) is accommodated from the surface), filled with resin, and the open surface is sealed with the resin. Therefore, the current sensor (that is, the case) protrudes from the open surface (intake surface) side, and the wire fixing surface and the center axis of the wire insertion hole are within a radius of the wire insertion hole. In addition, when the guide portion is formed integrally with the current sensor, the guide portion partially blocks the intake surface of the current sensor, and the circuit component can be easily taken in from the intake surface.

  Therefore, in the above plan (a plan in which the guide part is formed integrally with the current sensor), the wire insertion hole is not formed on the current sensor surface without impairing the circuit component from the current surface. There is a drawback that it is difficult to project the guide portion so that the distance between the central axis and the wire fixing surface of the guide portion is a distance within the radius of the wire insertion hole.

  In the above plan, the distance between the central axis of the wire insertion hole and the wire fixing surface of the guide portion on the intake surface side of the current sensor without impairing the circuit component insertion property from the intake surface. If the guide portion is formed to protrude so that the distance is within the radius of the wire insertion hole, the mold used for forming the guide portion becomes complicated, resulting in a manufacturing cost.

  Moreover, when fixing the electric wire to be measured to the guide portion, it is desirable for the measurement accuracy that the central axis of the electric wire coincides with the central axis of the electric wire insertion hole. Therefore, it is desirable that the distance between the central axis of the wire insertion hole and the wire fixing surface of the guide portion can be changed according to the diameter and type of the wire to be measured.

  Accordingly, a first object of the present invention is to provide a current sensor that has a guide portion for fixing an electric wire to be measured and can be formed at low cost.

  A second problem of the present invention is that the distance between the central axis of the wire insertion hole and the wire fixing surface of the guide portion is such that unnecessary stress is not applied to the guide portion when the guide portion and the wire are fixed. Providing a current sensor that can form a guide portion in the current sensor so that the distance is within the radius of the wire insertion hole, particularly when the guide portion is protruded from the intake surface side of the current sensor. The current sensor is adjusted so that the distance between the central axis of the wire insertion hole and the wire fixing surface of the guide part is within the radius of the wire insertion hole without impairing the circuit component insertion from the intake surface. An object of the present invention is to provide a current sensor capable of forming a guide portion.

  A third object of the present invention is to provide a current sensor that can change the distance between the central axis of the wire insertion hole and the wire fixing surface of the guide portion according to the diameter and type of the wire to be measured. .

  In order to solve the above-mentioned problem, the invention according to claim 1 is characterized in that a sensor main body having a wire insertion hole through which an electric wire to be measured is inserted, a detachably attached to the sensor main body, and the center of the wire insertion hole. A fixed guide having a guide portion that protrudes along the axial direction and to which the electric wire is fixed.

  According to a second aspect of the present invention, the guide portion of the fixed guide includes a central axis of the electric wire fixing surface of the guide portion and the electric wire insertion hole of the sensor main body in a state where the fixed guide is attached to the sensor main body. Is formed in the fixed guide so that the distance between the two is within the radius of the wire insertion hole.

  According to a third aspect of the present invention, the fixed guide is replaced with one having a different distance between the wire fixing surface of the guide portion and the central axis of the wire insertion hole, depending on the diameter or type of the electric wire to be measured. Is.

  According to a fourth aspect of the present invention, a locking claw is formed on the fixed guide mounting surface of the sensor body along a direction perpendicular to the central axis direction of the wire insertion hole of the sensor body, and the fixed guide is formed. A groove is formed on the sensor body mounting surface of the fixing guide so that a locking groove fitted to the locking claw is opened on a side surface of the fixed guide along a direction orthogonal to the extending direction of the guide portion of the fixed guide. When the side end portion of the locking claw of the sensor body is fitted from the open end portion of the locking guide on the side surface, the locking claw and the locking groove are engaged. The fixed guide is attached to the sensor body by fitting together.

  According to a fifth aspect of the present invention, a locking claw is formed on the fixed guide mounting surface of the sensor main body along the central axis direction of the wire insertion hole of the sensor main body, and the sensor main body mounting of the fixed guide A concave groove is formed on the surface so that a locking groove that engages with the locking claw is opened at a side surface of the fixed guide along the extending direction of the guide portion of the fixed guide. When the side end portion of the pawl is inserted from the open end portion of the side surface of the locking groove of the fixed guide, the locking pawl and the locking groove are engaged with each other, The fixed guide is attached to the sensor body.

  According to a sixth aspect of the present invention, the sensor main body is formed with a locking portion for positioning and fixing the position of the locking claw with respect to the fixed guide in the protruding line forming direction. A locked portion that engages with the stop portion is formed.

  According to a seventh aspect of the present invention, the guide portions are formed on both sides of the fixed guide.

  According to the first aspect of the present invention, the fixed guide having the guide portion is detachably attached to the sensor main body, that is, the fixed guide and the sensor main body are configured as separate bodies. Therefore, it is possible to prevent the metal mold used for forming the metal from being complicated, thereby reducing the cost of the metal mold, and forming the current sensor having the guide portion at low cost.

  According to the second aspect of the present invention, the guide portion of the fixed guide has an interval between the electric wire fixing surface of the guide portion and the central axis of the electric wire insertion hole of the sensor main body in a state where the fixed guide is attached to the sensor main body. Since it is formed in the fixed guide so that the distance is within the radius of the wire insertion hole, the distance between the wire fixing surface of the guide portion and the center axis of the wire insertion hole is within the radius of the wire insertion hole. A guide portion can be formed in the current sensor.

  In addition, since the fixed guide can be detachably removed from the sensor main body according to the first aspect of the invention, even when the guide portion protrudes from the circuit component intake surface side of the sensor main body, the circuit component from the intake surface is provided. The guide portion can be formed in the current sensor so that the distance between the central axis of the wire insertion hole and the wire fixing surface of the guide portion is within the radius of the wire insertion hole without impairing the take-in property.

  According to the third aspect of the present invention, the fixed guide can be replaced with one having a different distance between the wire fixing surface of the guide portion and the central axis of the wire insertion hole according to the diameter or type of the electric wire to be measured. Depending on the diameter or type of the electric wire to be measured, the electric wire to be measured can be fixed to the guide portion so that the central axis thereof coincides with the central axis of the electric wire insertion hole, and current detection with higher measurement accuracy can be performed.

  According to the fourth aspect of the present invention, since the fixed guide is fitted to the sensor body from the direction orthogonal to the central axis direction of the wire insertion hole of the sensor body, the sensor body is attached to the sensor body. The distance between the wire fixing surface of each guide portion and the center axis of the wire insertion hole is within the radius of the wire insertion hole so that the guide portions protrude from the both sides of the wire insertion hole along the central axis direction of the wire insertion hole. Thus, the guide portion can be formed in the fixed guide (and hence the current sensor).

  According to the fifth aspect of the present invention, since the center axis direction of the electric wire insertion hole matches the protruding line forming direction of the locking claw in the sensor body, the mold used for forming the sensor body is complicated. This can be prevented, thereby reducing the cost of the mold, and the sensor body can be formed at low cost.

  According to the sixth aspect of the present invention, the sensor body is formed with a locking portion for positioning and fixing the position of the locking claw of the locking guide in the ridge formation direction on the fixing guide, and on the other hand, the locking guide includes the engagement member. Since the locked portion that engages with the stop portion is formed, it is possible to prevent the fixed guide from being displaced in the direction in which the protrusion of the locking claw of the sensor main body is formed when the fixed guide is attached to the sensor main body. .

  According to the seventh aspect of the present invention, since the guide portions are formed on both sides of the fixed guide, the current sensor is firmly and stably attached to the electric wire to be measured by fixing the two guide portions to the electric wire. Can be fixed well.

<Embodiment>
A current sensor 1A according to this embodiment is used in a vehicle such as an automobile, for example, and as shown in FIG. 1, a sensor main body having a wire insertion hole 3a through which a measurement target wire (for example, a harness) is inserted. 3 and a fixed guide 5 that is detachably attached to the sensor body 3 and has a guide portion 5a that protrudes along the direction of the central axis C of the electric wire insertion hole 3a and is fixed to the electric wire. The

  This current sensor 1A includes an annular magnetic core through which a measurement target wire is inserted and a Hall element that outputs a Hall voltage corresponding to the strength of the magnetic field generated in the gap of the magnetic core. By outputting the Hall voltage corresponding to the current flowing through the outside, it is possible to measure the current flowing through the electric wire to be measured.

  The sensor body 3 is formed of a resin such as engineer plastic, PP, PBT (for example, PBT containing 30% glass), PPS (for example, PPS containing 40% glass), or the like. The sensor body 3 includes an attachment portion 3c for detachably attaching the fixed guide 5 to a case portion 3b that accommodates circuit components (the magnetic core, the Hall element, and the like), and an output voltage of the Hall element is externally output. For this purpose, a connector portion 3d is integrally formed.

  The case portion 3b is formed, for example, in a box-shaped resin case having an open top surface such as a cube in which a cylinder serving as a wire insertion hole 3a is provided in a penetrating manner on the bottom surface. The circuit components such as the magnetic core and the Hall element are accommodated from the entrance surface), filled with resin, and the open surface (intake surface) is sealed with the resin by the resin. Moreover, in order to improve waterproofness, a cover may be further attached on the resin surface.

  The mounting portion 3c is formed by, for example, a pair of locking claws 3f and a locking portion 3g on a side surface (fixed guide mounting surface) 3e on the side of the wire insertion hole 3a in the case portion 3b.

  Each locking claw 3f is formed with a ridge on the fixed guide mounting surface 3e along a direction orthogonal to the direction of the central axis C of the wire insertion hole 3a. Further, the respective locking claws 3f are formed so as to be spaced apart from each other and to be mirror images of each other. Here, each of the locking claws 3f has, for example, a side surface shape (cross-sectional shape) in which the front ends of the wall portions erected perpendicularly to the fixed guide mounting surface 3e are curved toward each other, and the front ends are further curved downward. I am doing.

  The locking portion 3g is formed so as to protrude, for example, in a flat cubic shape on one end side of the locking claw 3f on the fixed guide mounting surface 3e. A side surface 3h on the locking claw 3f side of the locking portion 3g is formed in an inclined surface so that a locking portion 5e described later on the fixed guide 5 side can be easily engaged, while the side surface in the locking portion 3g. The side surface 3i opposite to 3h is formed in a vertical surface shape so that the locked portion 5e is difficult to come off.

  The connector portion 3d is formed to protrude on the back surface of the case portion 3b, for example, and a terminal for outputting the output voltage of the Hall element accommodated in the case portion 3b to the outside is disposed in the connector portion 3d.

  The fixed guide 5 is formed of a resin such as engineer plastic, PP, PBT (for example, PBT containing 30% glass), PPS (for example, PPS containing 40% glass), or the like. The fixed guide 5 has a mounting portion 5b for detachably mounting the sensor body 3, and a guide portion 5a to which a measurement target electric wire is fixed is integrated with each of opposite side surfaces of the mounting portion 5b. It is formed to protrude.

  The mounting portion 5b is formed in, for example, a cubic block shape, and a locking groove that engages with a locking claw 3f and a locking portion 3g on the sensor body 3 side on the lower surface (sensor body mounting surface) 5c side. 5d and the to-be-latched part 5e are formed.

  The locking groove 5d has a cross-sectional shape (side shape) that is the same as the cross-sectional shape (side shape) of the locking claw 3f, and the guide portion 5a extends on the sensor body mounting surface 5c of the mounting portion 5b. A concave line is formed so as to open at the side surface 5h of the mounting portion 5b along the direction orthogonal to the direction.

  The locked portion 5e is, for example, engaged with a plate-like portion 5f formed so as to protrude from the side surface 5h of the mounting portion 5b to the side surface and to be flat with the sensor body mounting surface 5c of the mounting portion 5b. A stop hole 5g is formed.

  The guide portion 5a is formed in, for example, a flat and slender plate shape. When the fixed guide 5 is attached to the sensor body 3, the wire fixing surface (back surface) 5i and the central axis C of the wire insertion hole 3a of the sensor body 3 are provided. Is formed in the fixed guide 5 so that the distance between the two is within the radius of the wire insertion hole 3a.

  Further, a reinforcing rib portion 5j that reinforces the base of the guide portion 5a is formed across the side surface of the mounting portion 5b (formation surface of the guide portion 5a) and the surface on the proximal end side of the guide portion 5a.

  Next, how to fix the current sensor 1A to the measurement target wire will be described. In order to fix the current sensor 1A to the electric wire to be measured, first, the electric wire to be measured is inserted into the electric wire insertion hole 3a of the sensor main body 3 in a state where the sensor main body 3 and the fixing guide 5 are separated.

  Then, the fixed guide 5 is attached to the sensor body 3 as follows. That is, as shown in FIG. 2, the side end portion of the locking claw 3f of the sensor body 3 is fitted into the locking groove 5d from the open end at the side surface 5h of the locking groove 5d of the fixed guide 5, and the locking claw is left as it is. The entire locking claw 3f of the sensor body 3 is fitted along the locking groove 5d of the fixed guide 5 so that the entire 3f is fitted along the locking groove 5d. As a result, the locking claw 3f and the locking groove 5d are engaged. With this engagement, the fixed guide 5 is fixed (held) in the fixed guide mounting surface 3e of the sensor body 3, and the fixed guide 5 is fixed. The position of the locking claw 3f in the direction orthogonal to the protruding line forming direction (fitting direction) is positioned and fixed at a predetermined position. Further, in a state where the entire locking claw 3f is fitted in the locking groove 5d, the locked portion 5e of the fixed guide 5 is engaged with the locking portion 3g of the sensor body 3, and this engagement causes the fixed guide 5 5, the position of the locking claw 3f in the ridge formation direction (fitting direction) is positioned and fixed at a predetermined position. In this way, the fixed guide 5 is attached to the sensor body 3.

  In this attached state, as shown in FIG. 3, the distance d1 between the wire fixing surface 5i of the guide portion 5a of the fixed guide 5 and the central axis C of the wire insertion hole 3a of the sensor body 3 is the radius d2 of the wire insertion hole 3a. Each guide part 5a protrudes along the central axis C direction of the electric wire insertion hole 3a of the sensor main body 3 so that it may become the distance within.

  And the said electric wire penetrated by the electric wire penetration hole 3a is fixed to each guide part 5a of the fixed guide 5 by taping or a tie wrap. At that time, since the distance d1 between the wire fixing surface 5i of the guide portion 5a and the central axis C of the wire insertion hole 3a is a distance within the radius d2 of the wire insertion hole 3a, the wire fixing surface 5i of the guide portion 5a There is no gap between the wires (that is, the wires can be routed without any gaps on the entire wire fixing surface 5i of the guide portion 5a), and thus the guide portion 5a is not subjected to unnecessary stress. The electric wire is fixed. In this way, the current sensor 1A is fixed to the electric wire to be measured.

  According to the current sensor 1A configured as described above, the fixed guide 5 having the guide portion 5a is detachably attached to the sensor main body 3, that is, the fixed guide 5 and the sensor main body 3 are configured separately. Therefore, it is possible to prevent the molds used for forming the fixed guide 5 and the sensor main body 3 from being complicated, thereby reducing the cost applied to the molds and forming the current sensor having the guide portions 5a at a low cost.

  Further, the guide portion 5 a of the fixed guide 5 is a distance d 1 between the electric wire fixing surface 5 i of the guide portion 5 a and the central axis C of the electric wire insertion hole 3 a of the sensor main body 3 in a state where the fixed guide 5 is attached to the sensor main body 3. Is formed in the fixed guide 5 so that the distance is within the radius d2 of the wire insertion hole 3a. Therefore, the distance d1 between the wire fixing surface 5i of the guide portion 5a and the central axis C of the wire insertion hole 3a is defined as the wire insertion hole. The guide portion 5a can be formed in the current sensor 1A so that the distance is within the radius d2 of 3a.

  In addition, since the fixed guide 5 can be detachably removed from the sensor body 3, even when the guide portion 5a protrudes from the circuit component intake surface side of the sensor body 3, the circuit component can be easily inserted from the intake surface. Without damaging, the guide portion 5a is formed in the current sensor 1A so that the distance d1 between the central axis C of the wire insertion hole 3a and the wire fixing surface 5i of the guide portion 5a is within the radius d2 of the wire insertion hole 3a. it can.

  Further, a locking claw 3f is formed on the fixed guide mounting surface 3e of the sensor main body 3 along a direction orthogonal to the direction of the central axis C of the wire insertion hole 3a, while the sensor main body mounting surface 5c of the fixed guide 5 is formed. Further, along the direction perpendicular to the extending direction of the guide portion 5a, a recess groove is formed so that a locking groove 5d fitted to the locking claw 3f is opened at the side surface 5h of the fixed guide 5, and the sensor body 3 When the side end portion of the locking claw 3f is inserted from the open end of the side surface 5h of the locking groove 5d of the fixed guide 5, the locking claw 3f and the locking groove 5d are engaged with each other. Since the fixed guide 5 is attached to the sensor body 3, that is, since the fixed guide 5 is fitted to the sensor body 3 from the direction orthogonal to the direction of the central axis C of the wire insertion hole 3a of the sensor body 3, the fixed guide 5 With the sensor body 3 attached to the sensor body 3 The distance d1 between the electric wire fixing surface 5i of each guide portion 5a and the central axis C of the electric wire insertion hole 3a is such that the guide portion 5a protrudes from both sides along the central axis C direction of the electric wire insertion hole 3a. The guide portion 5a can be formed in the fixed guide 5 (and hence the current sensor 1A) so that the distance is within the radius d2 of the insertion hole 3a.

  Further, since the locking claw 3f and the locking groove 5d are formed and engaged with each other as described above, the fixed guide 5 and the sensor body 3 can be firmly fitted, and the fixed guide can be applied even when a relatively large external force is applied. 5 can be prevented from coming off from the sensor body 3.

  In addition, the sensor body 3 is formed with a locking portion 3g for positioning and fixing the position of the locking claw 3f in the protruding claw forming direction (fitting direction) with respect to the fixed guide 5, while the fixed guide 5 is Since the locked portion 5e that engages with the locking portion 3g is formed, the fixed guide 5 is in the state in which the fixed guide 5 is attached to the sensor main body 3, and the protruding direction ( It is possible to prevent displacement in the fitting direction.

  In addition, since the guide portions 5a are formed on both sides of the fixed guide 5, the current sensor 1A can be firmly and stably fixed to the measurement target wire by fixing the two guide portions 5a to the wire.

  Moreover, since the electric wire to be measured is inserted into the electric wire insertion hole 3a of the sensor body 3 and is fixed to the guide portion 5a of the fixing guide 5, the current sensor 1A can be fixed at an arbitrary portion of the electric wire to be measured.

  In this embodiment, the distance d1 between the wire fixing surface 5i of the guide portion 5a and the central axis C of the wire insertion hole 3a is further different depending on the diameter or type of the wire to be measured. You may make it replace with a thing. In this way, according to the diameter or type of the electric wire to be measured, the electric wire to be measured can be fixed to the guide portion 5a so that the central axis thereof coincides with the central axis C of the electric wire insertion hole 3a. Highly accurate current detection can be performed.

  In addition, since the fixed guide 5 can be replaced according to the diameter and type of the electric wire, the costly sensor body 3 can be generalized, and a current sensor that can handle various diameters and types of electric wires can be provided at low cost.

  In this embodiment, the guide portions 5 a are formed on both sides of the fixed guide 5. However, the guide portions 5 a may be formed only on one side of the fixed guide 5.

<Modification>
In the current sensor 1A of the above-described embodiment, the locking claw 3f of the sensor body 3 is formed with protrusions along the direction orthogonal to the direction of the central axis C of the wire insertion hole 3a, but the current sensor 1B of this modification example Then, as shown in FIGS. 4 to 6, the locking claws 3 f of the sensor body 3 are formed with ridges along the direction of the central axis C of the wire insertion hole 3 a.

  Hereinafter, parts different from those of the above-described embodiment will be described, and the same parts are denoted by the same reference numerals and description thereof will be omitted.

  In the current sensor 1 </ b> B of this modification, each locking claw 3 f of the sensor body 3 is formed with ridges on the fixed guide mounting surface 3 e of the sensor body 3 along the direction of the central axis C of the wire insertion hole 3 a. The locking portion 3g of the sensor body 3 is formed so as to protrude from one end side of the locking claw 3f on the fixed guide mounting surface 3e, as in the above embodiment.

  Further, the guide portion 5 a of the fixed guide 5 is integrally formed to protrude only on one side surface of the mounting portion 5 b of the fixed guide 5.

  The locking groove 5d of the fixed guide 5 is formed on the sensor body mounting surface 5c of the fixed guide 5 along the side surface of the mounting portion 5b along the extending direction of the guide portion 5a (surface facing the surface on which the guide portion 5a is formed) 5h. A concave streak is formed so as to open at '. The locked portion 5e of the fixed guide 5 is formed so as to protrude from the side surface 5h 'of the mounting portion 5b of the fixed guide 5 to the side surface side, and the sensor body mounting surface 5c of the mounting portion 5b. A locking hole 5g is formed in the plate-like portion 5f formed to be flat.

  The current sensor 1B is fixed to the measurement target wire in the direction in which the protrusions of the locking claws 3f of the sensor body 3 and the direction of formation of the grooves in the locking grooves 5d of the fixing guide 5 are as described above. Since it is the same as that of the said embodiment except the point changed into 1 and the point where the number of the guide parts 5a became one, it abbreviate | omits.

  According to the current sensor 1B configured as described above, the same effect as that of the above-described embodiment can be obtained, and the fixed guide mounting surface 3e of the sensor body 3 is aligned with the direction of the central axis C of the wire insertion hole 3a. Thus, the locking claw 3f is formed with a ridge, that is, in the sensor body 3, the direction of the central axis C of the wire insertion hole 3a coincides with the protruding ridge formation direction of the locking claw 3f. It is possible to prevent the mold used for the process from becoming complicated, thereby reducing the cost of the mold and forming the sensor body 3 at a low cost.

It is a disassembled perspective view of the current sensor which concerns on embodiment of this invention. It is a figure explaining the attachment method to the sensor main body of the fixed guide in embodiment of this invention. It is a perspective view of the current sensor which concerns on embodiment of this invention. It is a disassembled perspective view of the current sensor which concerns on a modification. It is a perspective view from the one side of the current sensor which concerns on a modification. It is a perspective view from the other side of the current sensor of FIG.

Explanation of symbols

1A, 1B Current sensor 3 Sensor body 3a Wire insertion hole 3e Fixed guide mounting surface 3f Locking claw 3g Locking portion 5 Fixed guide 5a Guide portion 5c Sensor body mounting surface 5d Locking groove 5e Locked portion 5h Side surface 5i Wire fixing Surface C Center axis d1 Distance between the wire fixing surface of the guide portion and the center axis of the wire insertion hole d2 Radius of the wire insertion hole

Claims (7)

A sensor body having a wire insertion hole through which a measurement target wire is inserted;
A fixed guide that is detachably attached to the sensor body, has a guide portion that protrudes along the direction of the central axis of the wire insertion hole, and that fixes the wire.
A current sensor comprising:   The guide portion of the fixed guide has a distance between the wire fixing surface of the guide portion and the central axis of the wire insertion hole of the sensor body in the state where the fixed guide is attached to the sensor body. The current sensor according to claim 1, wherein the current sensor is formed on the fixed guide so as to have a distance within a radius.   The said fixed guide is replaced | exchanged for what differs in the space | interval of the center axis | shaft of the electric wire fixing surface of the said guide part, and the said electric wire penetration hole according to the diameter or kind of the electric wire to be measured. The current sensor described. A locking claw is formed on the fixed guide mounting surface of the sensor body along the direction perpendicular to the central axis direction of the wire insertion hole of the sensor body,
A locking groove that engages with the locking claw is opened on a side surface of the fixed guide along a direction orthogonal to the extending direction of the guide portion of the fixed guide on the sensor body mounting surface of the fixed guide. A concave streak is formed,
A side end portion of the locking claw of the sensor body is fitted from an open end portion at the side surface of the locking groove of the fixed guide, whereby the locking claw and the locking groove are engaged. The current sensor according to any one of claims 1 to 3, wherein the fixed guide is attached to the sensor main body. A locking claw is formed on the fixed guide mounting surface of the sensor body along the central axis direction of the wire insertion hole of the sensor body,
A concave groove is formed on the sensor main body mounting surface of the fixed guide so that a locking groove that fits with the locking claw is opened on a side surface of the fixed guide along the extending direction of the guide portion of the fixed guide. ,
A side end portion of the locking claw of the sensor body is fitted from an open end portion at the side surface of the locking groove of the fixed guide, whereby the locking claw and the locking groove are engaged. The current sensor according to any one of claims 1 to 3, wherein the fixed guide is attached to the sensor main body. The sensor body is formed with a locking portion for positioning and fixing the position of the locking claw in the protruding line forming direction with respect to the fixed guide,
The current sensor according to claim 4, wherein a locked portion that engages with the locking portion is formed on the fixed guide.   The current sensor according to claim 1, wherein the guide portions are formed on both sides of the fixed guide.

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